Press guard



.1. P. UDAL PRESS GUARD juiy 14,1925.

, 1924 2 Sheets-Sheet 1 Filed July 28 Juiy '14, 1925.

J. P. UDAL PRESS GUARD Filed July 28, 1924 2 Sheets-Sheet 2 Lwanibi' e7.1 J

Patented July 14, 1925.

UNITED STATES JOHN POUNTNEY UDAL, OF BIRMINGHAM, ENGLAND.

PRESS GUARD.

Application filed July 28, 1924. Serial No. 728,745.

To all whom it may concern:

Be it known that I, JOHN POUNTNEY UDAL, a British subject, residing at91 Oakfield Road, Selly Park, in the city of Birmingham, England, haveinvented cer tain new and useful Improvements Belating to Press Guards,of which the following is a specification.

The invention has for its object to provide an improved hand guard forsuch machines as presses, stamps, hammers, and the like, the guard beingof the type in which an oscillatory lever system, actuated by theplunger or other moving part, is caused to move in a direction at rightangles to the front of the machine.

The invention comprises the combination of a carrier lever or leversystem pivoted on a stationary part of the machine and adapted toreceive motion from the machine, a lever or lever system provided with ahand striking member and pivoted on the first mentioned lever or leversystem, and constraining means attached to the machine and to the secondmentioned lever or lever systems, the arrangement being such that thesaid striking member is caused to move through a curvilinear path.

In the two accompanying sheets of explanatory drawings Figure 1 is asectional side elevation showing a press guard constructed in accordancewith this invention.

Figures 2 and 3 are front elevations showing the guard in theinoperative and operative positions respectively.

Figure 4. is a diagrammatic side view showing a modification of the handguard lever.

Figure 5 is a diagrammatic side view showing a modification of theconstraint acting? on the hand guard lever.

igure 6 is a similar view to Figure 5 showing a further modification.

In applying the invention as shown to a press having a verticallyreciprocating plunger a for carrying the upper tool, a carrier lever bis pivoted at its upper end on a bracket 0 secured to the front of themachine, the lever being arranged to oscillate in a plane at rightangles to the front of the machine. This lever may consist of a air ofsimilar parts connected by a cross shaft d and located at opposite sidesof the machine, the construction forming what 1s virtually a singlelever. The lever or a separately formed subsidiary lever 6 has pivotedon it a link f which is also pivoted to the plunger of the press or apart secured to the plunger. The connection with the plunger is effectedby an adjustable screw 9.

To the lower end of the above mentioned lever 12 is pivoted anintermediate point of a second lever h. This lever also consists of apair of elements, connected by a cross shaft 2', and forming virtually asingle lever. Between the inner pair of ends of the two parts of thelever h is arranged a hand strik ing piece j which extends across thefront of the machine and may consist of a spiral spring, a padded bar orany other suitable element which can strike the hand of the operativewithout causing injury to the hand. To the outer end of one of the partsof the lever or to a separately formed lever is, is pivoted aconstraining link Z which is also pivoted to the frame of the machine ora part carried on the frame. IVhen the plunger is in its upper positionthe lever h carrying the striking piece occupies a position nearly atright angles to the first lever, and the striking piece is in anunobstructive position leaving a clear space between the operative andthe upper and lower tools. As already stated the upper tool (not shown)is carried on the plunger, the lower tool (also not shown) being on thebed 172. of the machine. The link Z also occupies a nearly horizontalposition. The said link is preferably bent, cranked or otherwisesuitably shaped to avoid any risk of the operatives fingers beingpinched between the link and the part 70.

During the initial part of the downward movement of the plunger, thelink f connecting the plunger to the lever 6 causes an outward movementto be imparted to the lever b. The form and disposition of the lever 71.and link Z are such that the inner end of the lever h is caused by themotion of the lever 79 to move in a downwardly curved path towards theoperative. Should the operatives hands be in the way the striking piecewill thrust the hands outwards clear of the tools, and the greater partof the movement is effected before the tools come into action. Theposition to which the parts are moved is shown by dotted lines inFigure 1. Figure 3 also shows the guard in the operative position. Inthe return of the plunger the striking piece is returned to its initialunobstructive position shown by Figures 1 and 2.

It will be understood that the constructional details of the guard canbe varied to meet different requirements, but in all cases the essentialfeatures are as above described. Also the invention is applicable tohorizontal as well as vortical machines.

Referring to Figure at, it is advantageous in some cases to combine witheach lever h of the arrangement above described, an additional lever smounted at about a right angle to the lever ii, the two levers s atopposite sides of the machine being joined by a hand striking piece asimilar to the above mentioned part 7'. Figure 4 shows by full lines thedisposition of the parts when the plunger is at the top of its stroke.During the descent of the plunger the guard is moved to the positionshown by dotted lines. If the operatives hand is lying across thestriking piece a when the plunger commences its descent, the hand isfirst raised by the said piece. Immediately afterwards the hand ispushed out of danger by the striking piece j. This arrangement isespecially useful where, owing to some peculiarity in the configurationof the machine bed adjacent to the tools, the striking piece shown inFigures 1-3 might glide over the hand, when the latter is extended in ahorizontal position, and not effect the removal sufficiently early. Bymeans of the additional piece n which first lifts the hand, the dangerunder such conditions is effectively avoided.

Instead of the link Z shown in Figures 1 1, a fixed slotted member 1)(Figure 5) may be used for imposing the required constraint on thelevers h, 70, one end of the lever is being caused to slide in the slot.Alternatively a toothed wheel 9 may be secured to one end of the crossshaft 2' connecting the levers 71, and b. This wheel is arranged to meshwith a fixed toothed segment 1'" as shown in Figure 6. Oscillation ofthe lever 79 causes the lever 71 to swing between the limits shown byfull and dotted lines in that figure. In this arrangement the lever ofthe preceding mechanisms is not required.

In all cases, however, the pivoted system carrying or forming the guardis mounted on another pivoted system carried on the machine and actuatedby motion derived from the machine.

The lever systems 7) and it may both be provided with transverse rods 0,or have attached to them wire meshes to give further protection to theoperative, particularly against fragments thrown outwards from thetools.

Where the additional levers 8 shown in Figure 4 are employed, no crossrods or mesh is arranged between the said levers s as the space betweenthem must be left clear for the feeding of the work to the tools.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is 1. In hand guards for such machines aspresses, stamps, hammers and the like, the combination of a carrierlever system pivotally mounted on the stationary part of the machine, aguard lever system pivoted on the carrier system and normally arrangedat an angle to the carrier lever system and immediately adjacent themovable operating part of the machine, a hand striking member on theguard lever system, means for imparting motion to the carrier systemfrom the moving part of the machine to effect outward swinging movementof the carrier system, and constraining means attached to the guardlever system and to another part of the stationary part of the machineto ensure of the guard lever system being swung outwardly in a curvedpath from the main operating part of the machine simultaneously with theoutward swinging movement of the carrier system, the constraining meansacting to limit the outward swinging movement of both the carrier andguard lever systems.

2. An arrangement as claimed in claim 1, wherein the means for impartingmotion to the carrier lever system consists of an operating leverconnected with the carrier lever system, and a link connecting theoperating lever to the reciprocating part of the machine.

3. An arrangement as claimed in claim 1, wherein the guard lever systemincludes a pair of angularly disposed hand striking members, one ofwhich is adapted to raise the hand of the operative and the other topush the hand away from the tools simultaneously with the operation ofthe recipro eating part of the machine.

1. An arrangement as claimed in claim 1, wherein the guard lever systemincludes a pair of lever parts situated at angles with respect to eachother, and wherein a hand striking member is mounted at the outer end ofeach of said parts.

5. An arrangement as claimed in claim 1, wherein the constraining meansincludes an extension lever on the guard lever system, and aconstraining link pivoted to the outer end of the extension lever andalso pivotally attached to the stationary part of the machine frame.

6. In hand guards for presses and like machines in which a reciprocatingpart moves relatively to a stationary frame, the combination comprisinga pair of carrier levers, a horizontal pivot shaft carrying said levers,a pair of brackets carrying said shaft and respectively mounted on thefront IUD of the machine frame at opposite sides of the reciprocatingpart, an operating lever on said shaft, a link attached to the operatinglever, a screw connecting the link to the reciprocating part, a pair ofguard levers, a rod connecting the latter levers to the carrier levers,a hand striking member arranged transversely between the guard levers, athird lever secured to the said rod, a constraining link attached to thesaid third lever, and means for attaching the constraining link to themachine frame, sub stantially as described.

7. In hand guards for presses, stamps, hammers and the like, includingin combination with the base stationary side por tions and movable partof the machine a carrier lever system pivoted on the side portions ofthe machine at a point remote from the base, a guard lever systempivoted to the outer end of the carrier system and normally arranged atan angle thereto and immediately adjacent the movable part of themachine when the latter is in a retracted position, a hand strikingmember on the guard lever system, means for imparting motion to thecarrier system on the side portions of the machine so that the carriersystem will be swung outwardly therefrom, and constraining meanscooperating with the motion imparting means and attached to the guardlever system and to the side portions of the machine at a point on theside guard lever system opposite the base so that the guard lever systemwill be swung outwardly in a curved path from the main moving part ofthe machine simultaneously with the extending of this part of themachine and the outward movement of the carrier lever system,substantially as and for the purposes set forth.

8. In hand guards for such machines as presses, stamps, hammers and thelike, the combination with a main stationary part of the machine, spacedside portions extending from the main stationary part of the machine andthe main reciprocating part of the machine, a carrier lever systempivoted at its inner end to the side portion of the machine remote fromthe main stationary portion and also rearwardly of the mainreciprocating part of the machine, a guard lever system pivoted to theouter end of the carrier lever system and normally arranged at an angleto the carrier lever system and immediately in advance of the mainreciprocating part of the machine when the latter is in a retractedposition, means for impart ing outward swinging movement from thecarrier lever system to the inner portion of the reciprocating part ofthe machine, and constraining means cooperating with the carrier systemand attached tothe guard lever system at one end and to the sideportions of the machine adjacent the reciprocating part of the machinewhen the latter is in retracted position to ensure of the guard leversystem being swung in a curved path outwardly from the reciprocatingpart of the machine simultaneously with the operation of this part ofthe machine at the outward swinging movement of the carrier system.

In testimony whereof I have signed my name to this specification.

JOHN POUNTNEY UDAL.

